Abstract
Portland cement based materials are widely used for enhancing strength of soil mass as in jet grouting or other similar methods. However, degree of improvement depends not only on characteristics of cement but also on types of soil and their fine content. The relations between the soil's fine content and degree of improvement were studied in laboratory by changing both cement amount mixed and fine content. With the level 30% of fine content in the original soil as threshold, the effect of cement mixing differs widely. The authors are proposing two sets of simple formulae for soil with fine component less than 30% and for soil with more than 30% of fine content.
